Hundreds of air passengers faced delays at Luton airport following the arrest of a man in a security incident.

The man was being held in custody after trying to take an illegal substance, believed to be cleaning fluid, on to a plane.

The substance, discovered in the baggage area, was thought to have contaminated bags being loaded on to a plane operated by Monarch Airlines.

The plane, going to Faro in Portugal, was stuck for some time on the runway as the liquid was sent off for analysis. Check-in was also suspended at the airport. A policeman said: "We don't think this has terrorist undertones."